Clothes are a key part of weddings — and, it turns out, the marriage of art and commerce.

Katie Holmes, Josh Duhamel and Malin Akerman are among the well-dressed stars of upcoming film “The Romantics,” which is all about friends reuniting for a wedding with a few wounds still not healed. Here, fashion isn’t just playing a supporting role — it’s a key marketing partner for the film.

The cast, which also includes Adam Brody, Rebecca Lawrence and Jeremy Strong, reunited recently for a photo shoot for J.Crew and changed in and out of several outfits over the course of several hours for the retailer’s fall catalog and the brand’s website.

Holmes was turned out in black-sequin harem pants paired with a chambray button-down shirt, a combination she likes because it’s “a little more tomboy, a little Diane Keaton,” as well as a brown cocktail frock and a champagne-colored, flapper-inspired beaded number. That one was her favorite, Holmes says: “It’s flirty but grown-up, too.”

The vast studio in Chelsea marked a new sort of crossroads for fashion and film. “The Romantics” and J.Crew don’t just dabble in product placement — although some of the costumes were indeed J.Crew. The retailer is serving as a bona fide marketing partner, including covering the costs associated with the shoot.

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